Apply suggestions from code review

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: sirosen

Objects/setobject.c

@@ -2906,7 +2906,7 @@ static PyMethodDef frozenset_methods[] = {
     SET_SYMMETRIC_DIFFERENCE_METHODDEF
     SET_UNION_METHODDEF
     {"__class_getitem__", Py_GenericAlias, METH_O|METH_CLASS,
-     PyDoc_STR("frozenets are generic over the type of their contents")},
+     PyDoc_STR("frozensets are generic over the type of their contents")},
     {NULL,              NULL}   /* sentinel */
 };
 

Objects/unionobject.c

@@ -519,7 +519,7 @@ union_mro_entries(PyObject *self, PyObject *args)
 static PyMethodDef union_methods[] = {
     {"__mro_entries__", union_mro_entries, METH_O},
     {"__class_getitem__", union_class_getitem, METH_O|METH_CLASS,
-     PyDoc_STR("unions types support [] as part of the typing specification")},
+     PyDoc_STR("Create a union containing the given types")},
     {0}
 };